Warm the refried beans in a small saucepan over medium heat. Toss the shredded chicken with taco seasoning.
Spread a generous layer of warm refried beans on each tostada shell.
Top with seasoned shredded chicken, shredded lettuce, diced tomatoes, and sliced avocado.
Sprinkle with crumbled cotija cheese and drizzle with Mexican crema.
Garnish with fresh cilantro and serve with lime wedges on the side.